No notifaications from viber, whatsapp & messenger after updated to wp 8.1 cyan

Hi!
I just received the WP 8.1 update on my Lumia 1520. After Installation completed, I'm facing some problems from Whatsapp, Messenger & Viber, I have no notifications from these applications when I received new message and I appear as offline. This problem occurs only when I'm connected to a wifi, but when I use my Data Cellular, it's perfect. Any body can help me about this issue please. Thanks